Pravin B Shelar | 012a572 | 2013-08-19 11:23:07 -0700 | [diff] [blame] | 1 | #ifndef __NET_VXLAN_H |
| 2 | #define __NET_VXLAN_H 1 |
| 3 | |
Jesse Gross | 5f35227 | 2014-12-23 22:37:26 -0800 | [diff] [blame] | 4 | #include <linux/ip.h> |
| 5 | #include <linux/ipv6.h> |
| 6 | #include <linux/if_vlan.h> |
Pravin B Shelar | 012a572 | 2013-08-19 11:23:07 -0700 | [diff] [blame] | 7 | #include <linux/skbuff.h> |
| 8 | #include <linux/netdevice.h> |
| 9 | #include <linux/udp.h> |
Thomas Graf | ee122c7 | 2015-07-21 10:43:58 +0200 | [diff] [blame] | 10 | #include <net/dst_metadata.h> |
Pravin B Shelar | 012a572 | 2013-08-19 11:23:07 -0700 | [diff] [blame] | 11 | |
| 12 | #define VNI_HASH_BITS 10 |
| 13 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) |
| 14 | |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 15 | /* |
| 16 | * VXLAN Group Based Policy Extension: |
| 17 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 18 | * |1|-|-|-|1|-|-|-|R|D|R|R|A|R|R|R| Group Policy ID | |
| 19 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 20 | * | VXLAN Network Identifier (VNI) | Reserved | |
| 21 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 22 | * |
| 23 | * D = Don't Learn bit. When set, this bit indicates that the egress |
| 24 | * VTEP MUST NOT learn the source address of the encapsulated frame. |
| 25 | * |
| 26 | * A = Indicates that the group policy has already been applied to |
| 27 | * this packet. Policies MUST NOT be applied by devices when the |
| 28 | * A bit is set. |
| 29 | * |
| 30 | * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy |
| 31 | */ |
| 32 | struct vxlanhdr_gbp { |
| 33 | __u8 vx_flags; |
| 34 | #ifdef __LITTLE_ENDIAN_BITFIELD |
| 35 | __u8 reserved_flags1:3, |
| 36 | policy_applied:1, |
| 37 | reserved_flags2:2, |
| 38 | dont_learn:1, |
| 39 | reserved_flags3:1; |
| 40 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 41 | __u8 reserved_flags1:1, |
| 42 | dont_learn:1, |
| 43 | reserved_flags2:2, |
| 44 | policy_applied:1, |
| 45 | reserved_flags3:3; |
| 46 | #else |
| 47 | #error "Please fix <asm/byteorder.h>" |
| 48 | #endif |
| 49 | __be16 policy_id; |
| 50 | __be32 vx_vni; |
| 51 | }; |
| 52 | |
| 53 | #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF) |
| 54 | |
| 55 | /* skb->mark mapping |
| 56 | * |
| 57 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 58 | * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | |
| 59 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 60 | */ |
| 61 | #define VXLAN_GBP_DONT_LEARN (BIT(6) << 16) |
| 62 | #define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16) |
| 63 | #define VXLAN_GBP_ID_MASK (0xFFFF) |
| 64 | |
| 65 | /* VXLAN protocol header: |
| 66 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 67 | * |G|R|R|R|I|R|R|C| Reserved | |
| 68 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 69 | * | VXLAN Network Identifier (VNI) | Reserved | |
| 70 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 71 | * |
| 72 | * G = 1 Group Policy (VXLAN-GBP) |
| 73 | * I = 1 VXLAN Network Identifier (VNI) present |
| 74 | * C = 1 Remote checksum offload (RCO) |
| 75 | */ |
Joe Stringer | 11bf782 | 2014-11-17 16:24:54 -0800 | [diff] [blame] | 76 | struct vxlanhdr { |
| 77 | __be32 vx_flags; |
| 78 | __be32 vx_vni; |
| 79 | }; |
| 80 | |
Tom Herbert | 3bf3947 | 2015-01-08 12:31:18 -0800 | [diff] [blame] | 81 | /* VXLAN header flags. */ |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 82 | #define VXLAN_HF_RCO BIT(24) |
| 83 | #define VXLAN_HF_VNI BIT(27) |
| 84 | #define VXLAN_HF_GBP BIT(31) |
Tom Herbert | dfd8645 | 2015-01-12 17:00:38 -0800 | [diff] [blame] | 85 | |
| 86 | /* Remote checksum offload header option */ |
| 87 | #define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */ |
| 88 | #define VXLAN_RCO_UDP 0x80 /* Indicate UDP RCO (TCP when not set *) */ |
| 89 | #define VXLAN_RCO_SHIFT 1 /* Left shift of start */ |
| 90 | #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1) |
| 91 | #define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT) |
Tom Herbert | 3bf3947 | 2015-01-08 12:31:18 -0800 | [diff] [blame] | 92 | |
| 93 | #define VXLAN_N_VID (1u << 24) |
| 94 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) |
Alexey Kodanev | 40fb70f | 2015-03-13 19:13:53 +0300 | [diff] [blame] | 95 | #define VXLAN_VNI_MASK (VXLAN_VID_MASK << 8) |
Tom Herbert | 3bf3947 | 2015-01-08 12:31:18 -0800 | [diff] [blame] | 96 | #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) |
| 97 | |
Thomas Graf | 0dfbdf4 | 2015-07-21 10:44:02 +0200 | [diff] [blame] | 98 | #define VNI_HASH_BITS 10 |
| 99 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) |
| 100 | #define FDB_HASH_BITS 8 |
| 101 | #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) |
| 102 | |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 103 | struct vxlan_metadata { |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 104 | u32 gbp; |
| 105 | }; |
| 106 | |
Pravin B Shelar | 012a572 | 2013-08-19 11:23:07 -0700 | [diff] [blame] | 107 | /* per UDP socket information */ |
| 108 | struct vxlan_sock { |
| 109 | struct hlist_node hlist; |
Pravin B Shelar | 012a572 | 2013-08-19 11:23:07 -0700 | [diff] [blame] | 110 | struct work_struct del_work; |
| 111 | struct socket *sock; |
| 112 | struct rcu_head rcu; |
| 113 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
| 114 | atomic_t refcnt; |
Or Gerlitz | dc01e7d | 2014-01-20 13:59:21 +0200 | [diff] [blame] | 115 | struct udp_offload udp_offloads; |
Tom Herbert | dfd8645 | 2015-01-12 17:00:38 -0800 | [diff] [blame] | 116 | u32 flags; |
Pravin B Shelar | 012a572 | 2013-08-19 11:23:07 -0700 | [diff] [blame] | 117 | }; |
| 118 | |
Thomas Graf | 0dfbdf4 | 2015-07-21 10:44:02 +0200 | [diff] [blame] | 119 | union vxlan_addr { |
| 120 | struct sockaddr_in sin; |
| 121 | struct sockaddr_in6 sin6; |
| 122 | struct sockaddr sa; |
| 123 | }; |
| 124 | |
| 125 | struct vxlan_rdst { |
| 126 | union vxlan_addr remote_ip; |
| 127 | __be16 remote_port; |
| 128 | u32 remote_vni; |
| 129 | u32 remote_ifindex; |
| 130 | struct list_head list; |
| 131 | struct rcu_head rcu; |
| 132 | }; |
| 133 | |
| 134 | struct vxlan_config { |
| 135 | union vxlan_addr remote_ip; |
| 136 | union vxlan_addr saddr; |
| 137 | u32 vni; |
| 138 | int remote_ifindex; |
| 139 | int mtu; |
| 140 | __be16 dst_port; |
| 141 | __u16 port_min; |
| 142 | __u16 port_max; |
| 143 | __u8 tos; |
| 144 | __u8 ttl; |
| 145 | u32 flags; |
| 146 | unsigned long age_interval; |
| 147 | unsigned int addrmax; |
| 148 | bool no_share; |
| 149 | }; |
| 150 | |
| 151 | /* Pseudo network device */ |
| 152 | struct vxlan_dev { |
| 153 | struct hlist_node hlist; /* vni hash table */ |
| 154 | struct list_head next; /* vxlan's per namespace list */ |
Jiri Benc | b1be00a | 2015-09-24 13:50:02 +0200 | [diff] [blame] | 155 | struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */ |
| 156 | #if IS_ENABLED(CONFIG_IPV6) |
| 157 | struct vxlan_sock *vn6_sock; /* listening socket for IPv6 */ |
| 158 | #endif |
Thomas Graf | 0dfbdf4 | 2015-07-21 10:44:02 +0200 | [diff] [blame] | 159 | struct net_device *dev; |
| 160 | struct net *net; /* netns for packet i/o */ |
| 161 | struct vxlan_rdst default_dst; /* default destination */ |
| 162 | u32 flags; /* VXLAN_F_* in vxlan.h */ |
| 163 | |
| 164 | struct timer_list age_timer; |
| 165 | spinlock_t hash_lock; |
| 166 | unsigned int addrcnt; |
Tom Herbert | 58ce31c | 2015-08-19 17:07:33 -0700 | [diff] [blame] | 167 | struct gro_cells gro_cells; |
Thomas Graf | 0dfbdf4 | 2015-07-21 10:44:02 +0200 | [diff] [blame] | 168 | |
| 169 | struct vxlan_config cfg; |
| 170 | |
| 171 | struct hlist_head fdb_head[FDB_HASH_SIZE]; |
| 172 | }; |
| 173 | |
Tom Herbert | 359a0ea | 2014-06-04 17:20:29 -0700 | [diff] [blame] | 174 | #define VXLAN_F_LEARN 0x01 |
| 175 | #define VXLAN_F_PROXY 0x02 |
| 176 | #define VXLAN_F_RSC 0x04 |
| 177 | #define VXLAN_F_L2MISS 0x08 |
| 178 | #define VXLAN_F_L3MISS 0x10 |
| 179 | #define VXLAN_F_IPV6 0x20 |
| 180 | #define VXLAN_F_UDP_CSUM 0x40 |
| 181 | #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 |
| 182 | #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 |
Tom Herbert | dfd8645 | 2015-01-12 17:00:38 -0800 | [diff] [blame] | 183 | #define VXLAN_F_REMCSUM_TX 0x200 |
| 184 | #define VXLAN_F_REMCSUM_RX 0x400 |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 185 | #define VXLAN_F_GBP 0x800 |
Tom Herbert | 0ace2ca | 2015-02-10 16:30:32 -0800 | [diff] [blame] | 186 | #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 |
Thomas Graf | ee122c7 | 2015-07-21 10:43:58 +0200 | [diff] [blame] | 187 | #define VXLAN_F_COLLECT_METADATA 0x2000 |
Tom Herbert | 359a0ea | 2014-06-04 17:20:29 -0700 | [diff] [blame] | 188 | |
Simon Horman | d299ce1 | 2015-03-12 11:00:10 +0900 | [diff] [blame] | 189 | /* Flags that are used in the receive path. These flags must match in |
Tom Herbert | af33c1a | 2015-01-20 11:23:05 -0800 | [diff] [blame] | 190 | * order for a socket to be shareable |
| 191 | */ |
| 192 | #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ |
| 193 | VXLAN_F_UDP_ZERO_CSUM6_RX | \ |
Tom Herbert | 0ace2ca | 2015-02-10 16:30:32 -0800 | [diff] [blame] | 194 | VXLAN_F_REMCSUM_RX | \ |
Thomas Graf | ee122c7 | 2015-07-21 10:43:58 +0200 | [diff] [blame] | 195 | VXLAN_F_REMCSUM_NOPARTIAL | \ |
Alexei Starovoitov | da8b43c | 2015-08-04 22:51:07 -0700 | [diff] [blame] | 196 | VXLAN_F_COLLECT_METADATA) |
Thomas Graf | ac5132d | 2015-01-15 03:53:56 +0100 | [diff] [blame] | 197 | |
Thomas Graf | 0dfbdf4 | 2015-07-21 10:44:02 +0200 | [diff] [blame] | 198 | struct net_device *vxlan_dev_create(struct net *net, const char *name, |
| 199 | u8 name_assign_type, struct vxlan_config *conf); |
| 200 | |
Jiri Benc | b1be00a | 2015-09-24 13:50:02 +0200 | [diff] [blame] | 201 | static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan, |
| 202 | unsigned short family) |
Thomas Graf | 614732e | 2015-07-21 10:44:06 +0200 | [diff] [blame] | 203 | { |
Jiri Benc | b1be00a | 2015-09-24 13:50:02 +0200 | [diff] [blame] | 204 | #if IS_ENABLED(CONFIG_IPV6) |
| 205 | if (family == AF_INET6) |
| 206 | return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport; |
| 207 | #endif |
| 208 | return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport; |
Thomas Graf | 614732e | 2015-07-21 10:44:06 +0200 | [diff] [blame] | 209 | } |
Pravin B Shelar | 4956053 | 2013-08-19 11:23:17 -0700 | [diff] [blame] | 210 | |
Jesse Gross | 5f35227 | 2014-12-23 22:37:26 -0800 | [diff] [blame] | 211 | static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, |
| 212 | netdev_features_t features) |
Joe Stringer | 11bf782 | 2014-11-17 16:24:54 -0800 | [diff] [blame] | 213 | { |
Jesse Gross | 5f35227 | 2014-12-23 22:37:26 -0800 | [diff] [blame] | 214 | u8 l4_hdr = 0; |
| 215 | |
| 216 | if (!skb->encapsulation) |
| 217 | return features; |
| 218 | |
| 219 | switch (vlan_get_protocol(skb)) { |
| 220 | case htons(ETH_P_IP): |
| 221 | l4_hdr = ip_hdr(skb)->protocol; |
| 222 | break; |
| 223 | case htons(ETH_P_IPV6): |
| 224 | l4_hdr = ipv6_hdr(skb)->nexthdr; |
| 225 | break; |
| 226 | default: |
| 227 | return features;; |
| 228 | } |
| 229 | |
| 230 | if ((l4_hdr == IPPROTO_UDP) && |
Joe Stringer | 11bf782 | 2014-11-17 16:24:54 -0800 | [diff] [blame] | 231 | (skb->inner_protocol_type != ENCAP_TYPE_ETHER || |
| 232 | skb->inner_protocol != htons(ETH_P_TEB) || |
| 233 | (skb_inner_mac_header(skb) - skb_transport_header(skb) != |
| 234 | sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) |
Jesse Gross | 5f35227 | 2014-12-23 22:37:26 -0800 | [diff] [blame] | 235 | return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK); |
Joe Stringer | 11bf782 | 2014-11-17 16:24:54 -0800 | [diff] [blame] | 236 | |
Jesse Gross | 5f35227 | 2014-12-23 22:37:26 -0800 | [diff] [blame] | 237 | return features; |
Joe Stringer | 11bf782 | 2014-11-17 16:24:54 -0800 | [diff] [blame] | 238 | } |
Joe Stringer | 23e62de | 2014-11-13 16:38:12 -0800 | [diff] [blame] | 239 | |
Joseph Gasparakis | e6cd988 | 2013-10-24 06:27:10 +0000 | [diff] [blame] | 240 | /* IP header + UDP + VXLAN + Ethernet header */ |
| 241 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) |
| 242 | /* IPv6 header + UDP + VXLAN + Ethernet header */ |
| 243 | #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) |
| 244 | |
| 245 | #if IS_ENABLED(CONFIG_VXLAN) |
Joseph Gasparakis | 53cf5275 | 2013-09-04 02:13:38 -0700 | [diff] [blame] | 246 | void vxlan_get_rx_port(struct net_device *netdev); |
Joseph Gasparakis | e6cd988 | 2013-10-24 06:27:10 +0000 | [diff] [blame] | 247 | #else |
| 248 | static inline void vxlan_get_rx_port(struct net_device *netdev) |
| 249 | { |
| 250 | } |
| 251 | #endif |
Jiri Benc | 705cc62 | 2015-08-20 13:56:28 +0200 | [diff] [blame] | 252 | |
| 253 | static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs) |
| 254 | { |
| 255 | return vs->sock->sk->sk_family; |
| 256 | } |
Jiri Benc | 48e92c4 | 2015-08-25 18:36:50 +0200 | [diff] [blame] | 257 | |
| 258 | #endif |